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I tend to agree with the above. I've had them on a couple of 10-22's as well. Spend the extra couple of bucks and get a quality one like a VQ or the like, or just modify the stock one yourself......
What I did was drill a 1/4" hole (I think - can't remember) in the stock one, and glue my old steel bolt buffer in place. MUCH faster to change mags than those little buttons, and it's free. You can round it off or leave it as it is - works perfect. I shoot from a bipod and it's never in the way.
Of course, you need a different bolt buffer, but who uses the stock one anyway?
I ordered one of the Ruger 10/22 titanium extended mag releases mfg by Power Custom and sold by Brownells. Very slick piece of kit, very efficient. Try it, you'll like it.